How does the human respiratory system work?
When we do strenuous exercise or get stressed, our breathing becomes more faster. The reason is that we need more oxygen. The respiration is a process of breathing in and out. In this process, we get oxygen and give off carbon dioxide that was formed in the body and also make energy we need.
In the body, there are respiratory organs: mouth, nose, bronchial tubes and lungs
They always help us breathe. The air enters the body through the mouth and the nose. Hairs of the nose filter pollutants in the air. And it passes bronchial tubes and finally goes in the lungs. When we inhale deeply, ribs rise and diaphragma goes down. So the air fills the lungs. On the contrary to this, while we exhale, ribs go down and diaphragm rises. As a result, the air flows out. Through this process, the exchange of oxygen and carbon dioxide happens and it is called an external respiration.
However, there is also an internal respiration. Blood carries oxygen to tissue cell and cells give carbon dioxide to the blood. Nutrients are burned by using the oxygen that reached tissue cell through the internal respiration therefore necessary energy for the body is produced. So it is the ultimate goal of breathing.
Thus, breathing is very important activity though it seems trivial because if we cannot breathe, we cannot make energy.